These days, medical X-rays come in
multiple formats: plain film used in dental exams and doctors» offices; fluoroscopy, which bounces a continuous X-ray
beam off contrast agents you've either injected or ingested, providing a moving real - time image of arteries and intestines; and the computed tomography (CT) scan, which couples a powerful computer with a circular array of extremely sensitive detectors to turn X-rays
into detailed cross sections of the body.
A projector breaks up each of the three primary colors
into multiple spectra and
beams two different images — one meant for the left eye, one meant for the right eye — to the screen in rapid succession, one right after the other.